Update docfx.json (dotnet#9452)

Author: gewarren

docfx.json

@@ -51,7 +51,7 @@
       "ms.topic": "managed-reference",
       "ms.prod": "dotnet-api",
       "products": ["https://authoring-docs-microsoft.poolparty.biz/devrel/7696cda6-0510-47f6-8302-71bb5d2e28cf"],
-      "feedback_system": "None",
+      "feedback_system": "Standard",
       "feedback_product_url": "https://aka.ms/feedback/report?space=61",
       "feedback_help_link_url": "https://learn.microsoft.com/answers/tags/97/dotnet",
       "feedback_help_link_type": "get-help-at-qna",